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In a laboratory, the Balmer-beta spectral line of hydrogen has a wavelength of 486.1 nm. If the line appears in a star's spectrum at

In a laboratory, the Balmer-beta spectral line of hydrogen has a wavelength of 486.1 nm. If the line appears in a star's spectrum at 485.6 nm, what is the star's radial velocity (in km/s)? (Enter the magnitude.) km/s Is it approaching or receding? O approaching O receding Is this a blueshift or a redshift? blueshift redshift

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